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fall line

noun
1.
an imaginary line, marked by waterfalls and rapids, where rivers descend abruptly from an upland to a lowland.
2.
(initial capital letters) Eastern U.S. the imaginary line between the Piedmont and the Atlantic coastal plain.
3.
Skiing. the path of natural descent from one point on a slope to another.
Origin of fall line
1880-1885
1880-85, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for fall line

fall line

noun
1.
(skiing) the natural downward course between two points on a slope
2.
the edge of a plateau

Fall Line

noun
1.
a natural junction, running parallel to the E coast of the US, between the hard rocks of the Appalachians and the softer coastal plain, along which rivers form falls and rapids
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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fall line in Science
fall line
  (fôl)   
A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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7
9
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